You can also set that preference to "During Drag Only" so that you can see the numbers while you are dragging, but they vanish when you release.

While we're on the topic of cropping you may find that on a laptop setting [Preferences > Appearance > Margin] to a higher-than-default number (e.g. 12 px) will make it easier to grab the corners of the image when cropping. The default margin only leaves 3px between the edge of the frame (which you grab to crop) and the edge of the tools/browser (which you grab to resize the tools or browser).